Nortel Communication Server 100 Manual page 33

Memory
The Remote Carrier Interface memory stores the following programs and
data:
•
Boot code and self-test code are stored in the EPROM.
•
Data is stored in the RAM.
•
Code that is downloaded by the system CPU to the Remote Carrier
Interface card and main MPU function code are stored in the RAM.
•
Data containing the Remote Carrier Interface card identification and
version is stored in the EEPROM.
Card-LAN interface
To implement the Card-LAN interface, the Remote Carrier Interface card
uses a dual-Universal Asynchronous Receiver-Transmitter (UART) device.
One UART channel is a serial communication interface to IPE cards. The
other UART channel is the communication link between the Local Carrier
Interface card and the Remote Interface card MPUs over the carrier link.
Card-LAN function is performed in the system and it doesn't provide an
external physical connection.
The Card-LAN is a 19.2 kbps asynchronous interface. It is used to poll and
communicate with IPE cards through the Remote Carrier Interface card to
transmit maintenance messages, which include:
•
LED control of the IPE card enable/disable
•
Peripheral card configuration
•
Peripheral card type and version information
IPE interface
The IPE interface links IPE cards to the Remote Carrier Interface MPU
using sixteen DS-30X loops, one for each IPE card, and contains the
following Remote Carrier Interface circuits:
•
Dual formatter that transforms serial peripheral loop information into
parallel Integrated Voice and Data (IVD) bus information and parallel
IVD bus information to serial peripheral loop information.
•
Message handler that performs channel associated signaling to and
from the IPE cards. It receives signaling information from the IPE
cards; then the MPU accesses this information, interprets it, and sends
it to the Local Carrier Interface in the appropriate format. From the
Local Carrier Interface, the signaling messages are received and
interpreted by the Remote Carrier Interface MPU and sent to the serial
peripheral loops in the appropriate format.
Nortel Communication Server 1000
Carrier Remote IPE Fundamentals
NN43021-555 04.01 4 June 2010
Copyright © 2007-2010 Nortel Networks. All Rights Reserved.
Functional description 33